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Supporting a block size greater than the page size (BS > PS) requires support for large folios. However, several features (e.g., encrypt) do not yet support large folios. To prevent conflicts, this patch adds checks at mount time to prohibit these features from being used when BS > PS. Since these features cannot be changed on remount, there is no need to check on remount. This patch adds s_max_folio_order, initialized during mount according to filesystem features and mount options. If s_max_folio_order is 0, large folios are disabled. With this in place, ext4_set_inode_mapping_order() can be simplified by checking s_max_folio_order, avoiding redundant checks. Signed-off-by: Baokun Li <libaokun1@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Message-ID: <20251121090654.631996-24-libaokun@huaweicloud.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.